A/O流化床生物膜反应器处理煤制乙二醇污水工业应用研究

煤制乙二醇污水是一种典型的煤化工污水，常规生化方法难以稳定处理，运行成本高。A/O流化床生物膜反应器具有微生物浓度高、容积负荷和污泥负荷高、传质快、耐冲击负荷能力强、处理效果好等特点，利用A/O流化床生物膜反应器处理煤制乙二醇污水，考察了C/N比、水力停留时间、硝态液回流比等运行条件对污水处理效果的影响，并对A/O流化床生物膜工艺和传统A/O池工艺进行了经济技术分析。结果表明：在C/N比为3.5~5.0、好氧反应器水力停留时间为10~21 h、硝态液回流比为1.5~4.5的条件下，装置运行效果最佳，出水平均COD为 18.3 mg/L，氨氮质量浓度为 4.7 mg/L，总氮质量浓度为19.3 mg/L；与传统A/O池工艺相比，废气排放量减少80%，剩余污泥量减少43%，工程投资节约16%，运行成本降低30%。

INDUSTRIAL APPLICATION OF ANOXIC/OXIC FLUIDIZED BED BIOFILM REACTOR FOR COAL TO EG WASTEWATER TREATMENT

The wastewater from coal to ethylene glycol is a typical coal chemical wastewater, which is difficult to be treated stably by conventional biochemical treatment and has high operation cost. The A/O fluidized bed biofilm reactor has the characteristics of high microbial concentration, high volume load and sludge load, fast mass transfer, strong impact load resistance and good treatment effect. The A/O fluidized bed biofilm reactor developed by SINOPEC(named A/O SFBBR) was used to treat glycol wastewater. The treating effects of operating conditions, such as C/N, HRT and nitrate liquid reflux ratio, were investigated. The economic technique analysis for SFBBR and traditional A/O reactor were compared. The results showed that: (1) the performance of SFBBR was best when the C/N was in the range of 3.5 to 5.0, the hydraulic retention time (HRT) of aerobic reactor was in the range of 10 to 21h and the nitrate reflux ratio was in the range of 1.5 to 4.5; and the average COD, NH4--N and TN concentration of the effluent were 18.3 mg/L, 4.7 mg/L and 19.3 mg/L, respectively; (2) compared with the traditional A/O reactor, the SFBBR exhaust gas emission reduced by about 80%, waste produced sludge reduced by about 43%, the project investment decreased by about 16%, and the operating cost reduced by 30% approximately.